his belief that aliens walk among us and are right here with us, but we do not know who they are

a) Believing implies holding onto...doing that prevents one from seeing knowledge moving through one.

b) Being implies native within nature and foreign to one another, hence alien/alius - "another". The freedom to wander among one another represents space/spatior - "to wander".

c) If one joins a pluralism (us; we); then one walks among one another aka aliens.

d) Morpheus/morphē - "form, shape, figure"...only within flow (inception towards death) can form (life) be shaped. Another tempts one to ignore figuring this out for self.